Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfabfe03c4f8ba6…

MALICIOUS

PDF

84.5 KB Created: 2021-08-24 07:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c302015e5d175eef9eb7b87dc5fff99e SHA-1: eab14d29b9f9a24bf5792a7d1b990b6e3cfd7063 SHA-256: 4bfabfe03c4f8ba624d8ef36da57ca6ebb0f1aedbb1c25d1e451755aaaee5828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://windfreeklima.com/upload/ckfinder/files/33102638257.pdf In PDF document text
    • http://dobrejaja.com/Upload/file/vumumuvedudisub.pdfIn PDF document text
    • https://dineflon.com//files/kojuritavizewadetogodaxis.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607595ecbac87---26374279705.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/23548583667.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/wimubuzanobija.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/30092967745.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdbbe0324a---jamonujitorul.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090df5c10c15---rixefobiraduvevu.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/72352701724.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/24935251553.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/qvpa0bcb90nf9bhqp4iflumgme/bewasi.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/tifopigulujigute.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/59927024897.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mkeutb40ap3hcnhn649ollk1ma/97347512856.pdfIn PDF document text
    • http://sivam.pl/files/file/53215736539.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/19566838108.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/21936661208.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160992101dfd21---95481798183.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/84870718645.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p1ujpqgv48p78hgngb1trcrmf2/xigisewikozaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+lost+binding+of+isaac+rebirthPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CF 17200 bytes
SHA-256: 804207e4f214edb1d319a672d8c35ee8c9692bda5ef79ac215bfe3b974e37a15
font_01_sfnt_off000112da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF1 10860 bytes
SHA-256: 85fbd435c60598348884d443cc56e0c78b340c456a3c0cbce535ceaa5a203c39